wouldnt the air in the tunnel get super toxic due to emissions? would we seriously pay taxes to not only dig all of these tunnels but also to ventilate the tunn

wouldnt the air in the tunnel get super toxic due to emissions? would we seriously pay taxes to not only dig all of these tunnels but also to ventilate the tunnels!?! Might be okay once we are all on clean fuels... until then it is too farfetched